<?xml version="1.0"?>
<?xml-stylesheet type="text/css" href="chrome://global/skin"?>
<?xml-stylesheet type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"?>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=
-->
<window title="Mozilla Bug "
        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
  <script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"/>

  <!-- test results are displayed in the html:body -->
  <body xmlns="http://www.w3.org/1999/xhtml">
  <a href="https://bugzilla.mozilla.org/show_bug.cgi?id="
     target="_blank">Mozilla Bug </a>
  </body>

  <!-- test code goes here -->
  <script type="application/javascript">
  <![CDATA[
  /** Test for Bug  **/
  let Ci = Components.interfaces;
  var obs = Components.classes["@mozilla.org/observer-service;1"]
                      .getService(Ci.nsIObserverService);
  var didCall = false;
  var observer = {
    QueryInterface: function QueryInterface(aIID) {
      if (aIID.equals(Ci.nsIObserver) ||
          aIID.equals(Ci.nsISupports))
        return this;
      throw Components.results.NS_NOINTERFACE;
    },
    observe: function(subject, topic, data) {
      obs.removeObserver(observer, "cycle-collector-begin");
      observer = null;
      didCall = true;
    }
  };

  // Start an incremental GC, to make sure that calling ccSlice
  // when an IGC is running finishes the GC.
  SpecialPowers.Cu.getJSTestingFunctions().gcslice(1);

  // Make sure that we call the observer even if we're in the middle
  // of an ICC when we add the observer. See bug 981033.
  SpecialPowers.finishCC();
  SpecialPowers.ccSlice(1);

  obs.addObserver(observer, "cycle-collector-begin", false);

  SpecialPowers.DOMWindowUtils.cycleCollect();

  ok(didCall, "Observer should have been called!");
  ]]>
  </script>
</window>
